https://github.com/jamesmartin/unconditional-rails-views

Example using some syntactic sugar to move existential conditionals from view templates to helpers
https://github.com/jamesmartin/unconditional-rails-views

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Example using some syntactic sugar to move existential conditionals from view templates to helpers

• Host: GitHub
• URL: https://github.com/jamesmartin/unconditional-rails-views
• Owner: jamesmartin
• Created: 2015-02-21T10:37:59.000Z (almost 10 years ago)
• Default Branch: master
• Last Pushed: 2015-02-22T22:53:37.000Z (almost 10 years ago)
• Last Synced: 2024-10-27T04:49:34.541Z (about 2 months ago)
• Language: Ruby
• Size: 156 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Unconditional Rails Views

This is a simple Rails app with one controller, one view template and a couple

of partials. The app demonstrates an experiment to move existential conditional

logic out of view templates and partials, leaving behind declarative method

calls to indicate the dependencies of that view.

Here's a before and after:

```haml

%h1 Greetings

= render partial: 'shared/greeting', locals: { name: 'Bill Evans' }

```

```haml

  - if defined?(name)

    %p Hello, #{name}.

  - else

    %p Hello, there.

  - if defined?(name)

    Listen, #{name}, it's been fun, but I have to get going.

  - if @foo.present?

    %p Here's something from the controller: #{foo}

```

```haml

  - depend_on(local_assigns)

  - with_local(:name) do |name|

    %p Hello, #{name}.

  - without_local(:name) do

    %p Hello, there.

  - with_local(:name) do |name|

    %p Listen, #{name}, it's been fun, but I have to get going.

  - with_global(:foo) do |foo|

    %p Here's something from the controller: #{foo}

```

This might not look like much, syntactically, but it represents a [large shift](https://github.com/jamesmartin/unconditional-rails-views/blob/master/lib/unconditional_view/helpers.rb) in

*responsibility* from the perspective of the template or partial.

There are more [interesting

examples](https://github.com/jamesmartin/unconditional-rails-views/blob/master/app/views/application/index.html.haml), using a special interface to allow the

calling template control the visibility of the local based on some runtime

behaviour.